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Troubleshooting
Section V Troubleshooting
Error Codes
On Start Up:
ROM checksum. Check with Thermo.
Test failure. Locks up the program.
Display board failure. Clears when display board is fixed.
Critical checksum failure. Check with Thermo.
Synchronous communication error
Asynchronous communicatio error
Bad calibration data
Unusual Hardware Conditions
These errors will flash on the display and cannot be cleared. These are internal
controller problems.
through
- Interrupt errors during runtime.
BOM invalid. Contact Thermo.
Functional/ Machine errors
Warnings self-clear after the cause of the error is identified and corrected.
Faults require pressing I/0 to clear the error message and then pressing
I/0 again to start the unit after the cause of the error is identified and corrected.
Error Display Indication
Low temp setpoint warning/fault, see page 21
Low level warning, fluid below safe operating level
High temp setpoint warning/fault, see page 21
Refrigeration sensor shorted
Refrigeration sensor open
Shorted external temperature sensor (rtd2)
Open external temperature sensor (rtd2)
Shorted internal temperature sensor (rtd1)
Open internal temperature sensor (rtd1)
Fluid low level fault - unit shuts down
Refrigeration assembly high temp fault - unit shuts down
High temp fault - unit shuts down, see page 28
Continued on next page.
